kernel/dma: remove unnecessary unmap_kernel_range
vunmap will remove ptes. Link: https://lkml.kernel.org/r/20210322021806.892164-3-npiggin@gmail.comSigned-off-by: Nicholas Piggin <npiggin@gmail.com> Reviewed-by: Christoph Hellwig <hch@lst.de> Cc: Cédric Le Goater <clg@kaod.org> Cc: Uladzislau Rezki <urezki@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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